61677765 has 12 divisors (see below), whose sum is σ = 106908204. Its totient is φ = 32894784.

The previous prime is 61677757. The next prime is 61677767. The reversal of 61677765 is 56777616.

It can be written as a sum of positive squares in 2 ways, for example, as 7257636 + 54420129 = 2694^2 + 7377^2 .

It is not a de Polignac number, because 61677765 - 2³ = 61677757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1370617 = 61677765 / (6 + 1 + 6 + 7 + 7 + 7 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 61677765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61677767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 685264 + ... + 685353.

It is an arithmetic number, because the mean of its divisors is an integer number (8909017).

Almost surely, 2^61677765 is an apocalyptic number.

It is an amenable number.

61677765 is a deficient number, since it is larger than the sum of its proper divisors (45230439).

61677765 is a wasteful number, since it uses less digits than its factorization.

61677765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370628 (or 1370625 counting only the distinct ones).

The product of its digits is 370440, while the sum is 45.

The square root of 61677765 is about 7853.5192748220. The cubic root of 61677765 is about 395.1022861740.

The spelling of 61677765 in words is "sixty-one million, six hundred seventy-seven thousand, seven hundred sixty-five".